Schematics

PE7/ADC9
1
AGND
2
PE0
3
VUSB
4
VDDIO
5
VBAT
6
DGND
7
VDDBT
8
PWRKEY
9
BT ANT
10
BT OSCI
11
BT OSCO
12
ADC5/PB3
13
ADC10/MICL/PF2
14
DACR
15
DACL
16
U1
12
BT-ANT1
ANTENNA_PIFA
GND
L1
NC
R4 0R
L2
NC
BT RF
BT-OSCI
BT-OSCO
Y1
26MHZ
C6
NC
C1 NC
GND
DACL
GND
VUSB
VDDIO
VDDBT
MUTE
GND
C10 105
C8 105
C5 104
C3 NC
GND
VBUS
1
D-
2
D+
3
GND
4
G
5
G
6
G
7
G
8
G
9
1
USB-MICRO
VUSB
BT1
3.4V~4.2V
C11
105
VBAT
R9
2K2
CHRG
1
GND
2
BAT
3
VCC
4
PROG
5
U3
4054
CHARGE
R8
1K
LED00
LED4
0603/
红
GND
S1
VMCU
VMCU
LOUL-
LOUL+
C7
683
R2 3K
GND
C2 105
MUTE
C4
106
GND
DACL
VMCU
C9 472
1
2
J1 SPK
R3
33K
GND
SD
1
BYP
2
MODE
3
IN
4
VON
5
VDD
6
GND
7
VOP
8
GND
9
U2
5128
LOUL+
LOUL-
LED 2
VMCU
1
23
Q1
9014
GND
R5
10K
LED 1
R1
100K
VMCU
LED 3
LED1
3528
LED2
3528
LED3
3528
1
23
Q2
9014
GND
R6
10K
LED 2 1
23
Q3
9014
GND
R7
10K
LED 3
LED1
AB-5337